It really depends on what you want to do.
For example, I already have a tablet PC (the ones before tablets became cool.) It's 5 years old, 12" screen, but it has a keyboard and allows me to touch / doodle on the screen. I'd prefer to code, or really do anything intensive with a keyboard, on this rather than something like my Nexus. However... I enjoy reading / wathcing moves off of the Nexus7 because the screen and weight makes it very comfortable to hold in your hands. It's also a hell of a lot more portable and the battery last logner.
Again... it's a matter of what you need it for (thus there will be no right answer.)